an aquatic or terrestrial annelid worm with suckers at both ends. Many species are bloodsucking parasites, especially of vertebrates, and others are predators
habitually exploit or rely on
he's leeching off the abilities of others
a doctor or healer
the after or leeward edge of a fore-and-aft sail, the leeward edge of a spinnaker, or a vertical edge of a square sail